<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS三角巧妙运用-京东价格</title>
    <style>

        /* CSS三角效果 */
        /* .box{
            width: 0;
            height: 0;
            border-top: 50px solid pink;
            border-right: 50px solid skyblue;
            border-bottom: 50px solid blue;
            border-left:50px solid green;
        } */

        /* 直角三角形 */
        /* .box{ */
            /* width: 0; */
            /* height: 0; */
            /* 把上边框宽度调大 */
            /* border-top: 100px solid transparent; */
            /* border-right: 50px solid skyblue; */
            /* 左边和下边的边框宽度设置为0 */
            /* border-bottom: 0 solid transparent; */
            /* border-left:0 solid transparent; */
        /* } */

        /* 直角三角形简写 */
        .box{
            width: 0;
            height: 0;
            /* 1.只保留右边的边框有颜色 */
            border-color: transparent red transparent transparent;
            /* 2.样式都是solid */
            border-style: solid;
            /* 3.上边框宽度要大,右边框宽度稍小,其余的边框改为0 */
            border-width: 100px 50px 0 0;
        }

    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>